On the options desk that I was a quant on[1] the traders were extremely dismissive of Taleb's math chops since in his book "Taleb on Risk: Managing Vanilla and Exotic Options" he clearly doesn't understand delta hedging, which is a pretty fundamental concept, particularly if you're writing a book about managing options risk.

[1] Equity Exotics and Hybrids at Goldman in London circa 2005 or so.